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<br /> <br /> <br /> <br />In explanation of the first item, MODFLOW input packages (e.g., Recharge, Well, etc.) are often used to <br />represent more than one different type of model input per package. For example, the Recharge package <br />may be used to input to the model both irrigation recharge from irrigated lands and precipitation recharge <br />from areas of native vegetation. It is often very helpful in the modeling process to be able to track the <br />different input compon ents of a package from beginning to end of the model run. This is not easily done <br />with the current version of MODFLOW, and the effort required is time - consuming and potentially prone <br />to error. The first proposed enhancement would make this process more eff icient and accurate. <br /> <br />The second proposed enhancement involves a user - specified option to continue model execution despite <br />solver nonconvergence. During the model calibration process, automated model analyses such as <br />parameter estimation and sensitivity an alysis are often used to make the process more efficient. Solver <br />nonconvergence can prevent the completion of lengthy modeling runs utilizing these automated modeling <br />aids. This enhancement would solve this problem but print a warning to avoid inadvertent application. <br /> <br />Recommendation <br />Staff recommends that the Board request the General Assembly authorize $ 50 ,000 from the Construction <br />Fund to be appropriated to the Department of Natural Resources for allocation to the USGS to perform <br />the enhancements to MODFL . <br /> <br />2 <br /> <br />